no. 1
On quasi-equations in locally presentable categories II: A Logic
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 1, article no. 1, 26 p. 
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     pages = {3--28},
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     number = {1},
     year = {2010},
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     zbl = {1196.18003},
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Adámek, Jirí; Sousa, Lurdes. On quasi-equations in locally presentable categories II: A Logic. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 51 (2010) no. 1, article  no. 1, 26 p. http://www.numdam.org/item/CTGDC_2010__51_1_3_0/

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